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Abstract

A finite element method is applied to study the coupling between a nitrogen vacancy (NV) single photon emitter in nanodiamond and surface plasmons in a silver nanowire embedded in an alumina nanochannel template. We investigate the effective parameters in the coupled system and present detailed optimization for the maximum transmitted power at a selected optical frequency (650 nm). The studied parameters include nanowire length, nanowire diameter, distance between the dipole and the nanowire, orientation of the emitter and refractive index of the surrounding. It is found that the diameter of the nanowire has a strong influence on the propagation of the surface plasmon polaritons and emission power from the bottom and top endings of the nanowire.

Figures (10)

Fig. 1 a) Schematics of the 2D cross-section of the coupled nanowire-nanodiamond system. b) 2D
intensity plot of the calculated electric field of propagating surface plasmons in a silver
nanowire coupled to a dipole emitter with an emission wavelength of 650 nm. The emitter is
represented by a single NV center in nanodiamond, which is placed on top of the nanowire with
a 10 nm spacing from its surface. The dipole emitter is oscillating in y
axis. The silver nanowire is 240 nm long, 70 nm in diameter and is embedded in alumina.

Fig. 2 Transmitted power vs. nanowire length for nanowires of D = 70 nm embedded
in alumina (nd = 1.6). The emission wavelength is at
λ0 = 650 nm. The emitter is set 10 nm above the
nanowire and is oscillating in the y direction.

Fig. 4 (2D model) Normalized electric field along a silver nanowire with different diameters,
L = 2 μm, and λ0 = 650 nm. The
clear change of the wave vector (by counting the number of maxima) is observed by changing
the diameter.

Fig. 10 Purcell factor (PF), surface charge and far-field for some of the modeled configurations.
The dipole emitter in nanodiamond with an emission wavelength of 650 nm is oscillating in
y axis. The silver nanowire is embedded in alumina
(nd = 1.6).